Portable propeller



between which the arm is designed to slip,

and a locking pin 3l passed through these ears after the arm is located in position, pre-- vents displacement of the arm.

The forward free end of the foldable arm is fashioned with a bearing head 32 through which passes and in which is journaled hollow, horizontally disposed stud shaft 33 carrying the driving bevel gear 34 for the propeller. This driving gear meshes with a complementary driving pinion 35 on the transmission shaft 24 for conveying power to the propeller, which power `is developed through the pairs of crank arms 36 and 37.

These crank arms are located at the opposite sides of the driving gear and 'the bear ing head 32 and are adapted for manual application of power' in propelling the boat,

the power being transmitted through the hollow stud shaft to the driving gear 34 and thence through the transmission mechanism to the screw propeller.

Before the foldable arm 28 can be turned backward to dotted position in Figure l, it is neecssary that the driving gear-34 and its pinion 35 be disengaged, and for this purpose I provide a Vnovel Aarrangement in coniiection with the hollow driving shaft 33, the crank arm 36 `and gear 34. In Figure 3 it will be seen that vthe hub 38 of the crank arm 36 and the hub 39 of the gear 34 are provided with the respective pins 40 and 4l. These pins pass transversely through the hubs and the hollow shaft and are located at opposite sides of the bearing head 32, and a spring 42within-the hollow shaft has its respective ends anchored to the spaced pins. To accommlodate the `pin 40 the hollow shaft is fashioned with parallel complementary slots 43, and by this anchoring means it will be apparent that the spring which is under tension is instrumental in drawing and holding the hub 39 and sleeve or liollowshaft 33 in operative position'. Y The tension of the spring holds the hub 39 against bearing head 32, and holds the shaft in place with the hub of the crank arm 37V against the hub of the driving gear. By grasping the lgear wheel and pulling in a direction away from the bearing head^32 it will be apparent that the crank arm 37, gear wheel 34 and hollow Yshaft 33 will be moved relatively to the bearing head and crank arm 36. The slots 43 permit movement of the hollow shaft with relation to the pin 40 sufficient to disengage the teeth of the driving gear from the teeth of the driving pinion. lThen tlieV foldable arm (after pin Vor bolt 31 has been withdrawn) together with the driving gear and crank Varms may be swung upwardly, over to the 'rear or over the stern of the boat,1and down to the dotted position in Figure 1, to forma compact structurethat-may be stored in small space, and may easily be transported.V Y

To further reduce the space occupied 'by 1the Vdisina'i'itled attachment, the handles 44 on the crank arms are hinged thereto at 45 so that they may be -folded back to dotted `position in Figure 4 alongside the arms and out of the way. When in use the handles of course are projected perpendicular to the arms as in full lines Figures 2 and 4.

It will thus be obvious that the screw propeller may be turned for propulsion of the boat by means of manual power applied to one or Yboth of the crank arms, and that while the arms are ygrasped and being turned manually the boat may also be steered through ythe use of these-arms by turning the frame and the operating parts supported thereby bodily to swing the rudder or blade -15 in the desired direction. When not desired for use the bolt 8 may be loosened to release the clamp attachment and the vportably propelling and steering means may bodily` be detached from the stern lof the boat, and with the parts folded as described may be transported or stored with facility and convenience.

Having thus fully described my invention what I claim as new and desire to secure by letters patent isl l. The combination in an attachment as described with a hinged frame and avtiaiismission shaft therein having a pinion thereon, of a foldable arm pivoted on the frame and provided with a transversely arranged bearing Fliead, a shaft in the bearing head havinga gear for co-action with said pinion, Y

and means whereby said shaft may be moved in its bearing to release the Vgear and pinion for folding said arm.

2. The combination with a hinged iframe having a bearing Sleeve and perforated lockinglugs thereon, of Va foldable arm pivoted in. the frame and adapted to seat between said lugs and a locking pin for said lugs, a

transmission shaft journaled in the *sleeve and a pinion thereon, a bearing head 4at the free end of said arm and a relatively vin'ovable shaft in said sleeve, and a. gear to engage said pinion and movable with said shaft.

3. The combination with a hinged propeller frame having a bearing sleeve, of a foldable arm pivoted on said frame and 'means on the sleevefor holding said arm iii normal position, a transmission shaft journaled in the sleeve and carrying a pinion, a driving shaft )ournaled in the head and relatively `vmovable thereto, and a dri-vingv gear movable with said shaft and normally engaging said 4pinion.

4. Inan attachment as described'the coinbiiiation with a bearing head of a relatively movable, hollow, slotted Asha-ft` journaled therein and a crank arm for turning said y shaft, o-f a driving wheel and itshub von Ythe shaft and a locking pin securing said hub and shaft,.a,pin securing said crank arm with the slotted shaft, and a spring Within the hollow shaft suspended between said two l 5. The combination With a rigid bracket, of a propeller frame hinged therein and a propeller Shaft and propeller journaled in the frame, a Vertical transmission shaft journalecl in the pivoted frame and operatively connected With the propeller shaft, a hori- Zonta] transmission shaft journalecl in the 10 frame and operatively connected with the Vertical shaft, a foldable arm hinged to the frame and a bearing head thereon, a driving member supported 1n said head and a complementary driving member therefor 15 GRANVILLE M. BOYD. 

